原永东,向巍,黄惠宁,等. 广西靖西MS5.2地震重力仪记录的前驱波信号分析[J]. 华北地震科学,2020, 38(S2):74-79. doi:10.3969/j.issn.1003−1375.2020.S2.012.
引用本文: 原永东,向巍,黄惠宁,等. 广西靖西MS5.2地震重力仪记录的前驱波信号分析[J]. 华北地震科学,2020, 38(S2):74-79. doi:10.3969/j.issn.1003−1375.2020.S2.012.
YUAN Yongdong,XIANG Wei,HUANG Huining,et al. Precursor Wave Signals Recorded by Gravimeter before Guangxi Jingxi MS5.2 Earthquake[J]. North China Earthquake Sciences,2020, 38(S2):74-79. doi:10.3969/j.issn.1003−1375.2020.S2.012.
Citation: YUAN Yongdong,XIANG Wei,HUANG Huining,et al. Precursor Wave Signals Recorded by Gravimeter before Guangxi Jingxi MS5.2 Earthquake[J]. North China Earthquake Sciences,2020, 38(S2):74-79. doi:10.3969/j.issn.1003−1375.2020.S2.012.

广西靖西MS5.2地震重力仪记录的前驱波信号分析

Precursor Wave Signals Recorded by Gravimeter before Guangxi Jingxi MS5.2 Earthquake

  • 摘要: 收集了靖西MS5.2地震震中300 km范围内灵山、凭祥地震台站的gPhone重力仪记录的1 Hz采样率观测数据,经过零漂改正和气压改正后,采用巴特沃斯高通滤波器滤除固体潮信号。采用小波分析方法分析重力非潮汐观测数据在地震前后的小波功率谱,发现震前约200 s开始,重力信号中陆续出现了周期8~512 s的低频信号,该频段内的较低频信号出现得时间早,随后较高频信号依次出现;地震发生后该频段信号开始衰减,较高频信号首先衰减,随后较低频信号依次衰减消失;通过与测震观测数据的小波相干分析,发现重力仪记录到的地震前驱波在地震仪的频带宽度内具有较好的一致性。

     

    Abstract: The observation data of the gPhone gravimeters at the Lingshan and Pingxiang seismic stations within 300 km from the epicenter of the Jingxi MS5.2 earthquake are collected at a sampling rate of 1Hz. After zero drift correction and air pressure correction, the Butterworth high-pass filter is used to filter it. The solid tide signal in the signal, the wavelet power spectrum of the non-tidal gravity observation data before and after the earthquake is analyzed by wavelet analysis. It is found that low frequency signals with a period of 8~512 s appear in the gravity signal about 200 s before the earthquake, and the lower frequency signals in this frequency band appear early in time, then higher frequency signals appear in sequence; after the earthquake occurs, the signals in this frequency band begin to attenuate slightly, the higher frequency signals attenuate first, and then the lower frequency signals sequentially attenuate and disappear; through wavelet coherent analysis with seismic observation data, it is found that gravity the seismic precursor waves recorded by the instrument have good consistency within the frequency bandwidth of the seismograph.

     

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